US Patent 7933124 Electronic device with expansion card fasterning device

An electronic device includes a circuit board, an extension card, a cooling device, and a connecting member. The extension card is coupled to the circuit board. The cooling device includes an outer casing and an inner casing received in the outer casing. The connecting member includes a fixing end and an engaging end opposite to the fixing end. The fixing end is fixedly mounted on the outer casing. The engaging end is configured for fastening the extension card on the circuit board. The outer casing moves between a first position where the engaging end fastens the extension card and a second position where the engaging end is separated from the extension card to unfasten the extension card.